//题目：一个 5 位数，判断它是不是回文数。
//即 12321 是回文数，个位与万位相同，十位与千位相同
#include<stdio.h>
main()
{
    long ge,shi,qian,wan,x;
    scanf("%ld",&x);
    wan=x/10000;
    qian=x%10000/1000;
    shi=x%100/10;
    ge=x%10;
    if(ge==wan && shi==qian)
        printf("this number is a huiwen.\n");
    else
        printf("this number is not a huiwen.\n");


}